Router crash via unchecked fac_password buffer copy
Published Dec 16, 2025 · Updated Dec 16, 2025
Buffer overflow in Mercury D196G firmware d196gv1-cn-up_2020-01-09_11.21.44 allows remote attackers to crash the router via HTTP. The sub_404CAEDC function processes the fac_password value from a webPwd JSON request without checking its length, so an oversized string overflows its destination buffer. The published proof of concept includes a session cookie and stok token, while CISA assesses no privileges as required; the demonstrated consequence is a device crash.
Summary
What happened
Buffer overflow in Mercury D196G firmware d196gv1-cn-up_2020-01-09_11.21.44 allows remote attackers to crash the router via HTTP. The sub_404CAEDC function processes the fac_password value from a webPwd JSON request without checking its length, so an oversized string overflows its destination buffer. The published proof of concept includes a session cookie and stok token, while CISA assesses no privileges as required; the demonstrated consequence is a device crash.
The record
- CVE
- CVE-2025-50398
- Published
- Dec 16, 2025
- Updated
- Dec 16, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-120, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 16, 2025CVE publishedPublication date reported by the CVE source.
- Dec 16, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- HTTP fac_password crash proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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